Screw pump basic working principle of technology applications

The screw pump operates by using the rotational motion of the screws to draw in and expel liquid. Looking at the cross-section of a three-screw pump shown in the diagram, the central screw serves as the driving screw, powered by the main engine. On either side of this central screw are the driven screws, which rotate in the opposite direction to the driving screw. Both the driving and driven screws feature double-threaded designs. Due to the interlocking nature of the screws and their snug fit against the inner lining of the pump casing, one or more sealed chambers form between the intake and discharge sections of the pump. As the screws turn and engage, these sealed chambers continuously form at the suction side of the pump, trapping liquid within the suction chamber and progressively displacing it axially along the length of the screw towards the discharge end. Each chamber eventually closes off, releasing the liquid in a continuous flow. This process resembles how a nut moves steadily forward along a rotating screw, which is essentially the fundamental operating mechanism of a screw pump. In terms of its working principle, when the screw pump is operational, liquid is drawn into the system and enters the enclosed space created by the screw threads and the pump housing. As the driving screw turns, the volume of this sealed chamber increases due to the pressure exerted by the screw teeth. This increase in volume generates pressure within the pump while simultaneously propelling the liquid axially. Given that the screw maintains a consistent rotational speed, the output of liquid remains steady and uniform throughout operation. To further enhance efficiency, modern screw pumps often incorporate additional features such as improved sealants and materials that reduce friction and wear. These innovations help maintain optimal performance over extended periods while minimizing maintenance needs. Additionally, the design allows for precise control over flow rates, making it ideal for applications where consistent delivery is crucial, such as in oil transportation or chemical processing industries. Despite its relatively simple structure, the screw pump offers robust functionality and reliability, proving itself indispensable across various industrial sectors.

IECEx Approved Coriolis Mass Flow Meter

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The meter can be connected with computer as follows. Connect the meter and computer with a USB-to-RS485 converter( converter A+ end to transmitter A+ end, B- to B-, and GND to GDN); turn to device manager of the computer to check COM port connected with meter. Start the software, select the right COM port and click Connect; do not change any other parameters (if you do not know the right one, click Automatic options on the left, click Connect, plug & unplug the transmitter, and then check if it is connected). You can click Connect on the tool bar to disconnect or connect again. It will shown Connected/Not Connected at the bottom of this interface.

The flow direction is settable. There are 4 options, forward(default), reverse, absolute value & bi-direction. There is a direction mark on the sensor. Forward means the same direction with the mark on sensor, the meter will only count the flow in this direction; reverse means the opposite direction of the mark, the meter will only count the reverse direction; bidirectional means that the meter will measure both directions, it increases when it is forward and decreases when reverse; absolute means it increases no matter it is forward or reverse.

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